Friction and Gravity Energy, Machines, and Motion.

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Presentation transcript:

Friction and Gravity Energy, Machines, and Motion

Set up your notes!  In a way that you can take notes about TWO THINGS at the same time (friction and gravity)  Whatever way works for you is great!  Remember: you are NOTING not COPYING!  Ex: the slide says: Apples are a wonderful source of carbohydrates that give us energy!  You note: Apples = carbohydrates = energy  You do NOT need complete sentences.

Friction  The force that 2 surfaces exert on each other when they rub against each other is called __FRICTION__ What is Friction? Here is a video! CLICK HERE!CLICK HERE!

The Causes of Friction  The 2 factors that friction depends on are: __HOW HARD THE SURFACE PUSH TOGETHER AND THE TYPES OF SURFACES INVOLVED__  Friction acts in the __OPPOSITE DIRECTION__ to the object’s motion.

4 Types of Friction  STATIC FRICTION: Friction on objects that are NOT moving.  SLIDING FRICTION: When 2 solid surfaces slide over/past one another.  ROLLING FRICTION: Objects that roll across a surface  FLUID FRICTION: The type of friction that occurs when an object travels through a liquid.

GRAVITY  The force that pulls objects towards each other  Universal Gravitation  Universal Gravitation means that __ALL OBJECTS ARE ATTRACTED TO EACH OTHER.  Including you and the table! Here is a video! CLICK HERE!

Factors Affecting Gravity  __2__ factors that affect gravity are __MASS AND DISTANCE__  __MASS__ is a measure of the amount of matter in an object.  The SI unit of mass is the __KILOGRAM__ (or gram/milligram!)  __MORE__ mass and __ SHORTER__ distance means greater gravitational force.  Weight and Mass  __MASS__ is the amount of matter in an object; __WEIGHT__ is the force of gravity on an object.

Gravity and Motion  Free Fall  When the only force acting on a object is __GRAVITY__ the object is said to be in __FREE FALL__  Gravity is an __UNBALANCED FORCE__  Free Fall accelerates at a rate of __9.8 M/S 2 __  __ALL__ objects fall at the same rate.

Air Resistance  A type of fluid friction is __AIR RESISTANCE__  Air Resistance is an __UPWARD FORCE__  __TERMINAL VELOCITY__ is reached when the force of air resistance equals the weight of the object.

Projectile Motion  A __THROWN__ object is called a projectile  A projectile will fall at the __SAME__ rate as a dropped object.

Calculating Review  A car is traveling at 25 m/s for 100 seconds. How far does the car travel?  Annie runs 20 m/s for 110 meters. For how long (time ) did Annie run?  A barrel rolls down a 15 meter hill for 45 seconds. How fast is the barrel rolling?